Aging of Unrealized Losses on Investments in Fixed Maturities and Equity Securities Held in Perpetual Care Trusts (Detail) - Variable Interest Entity, Primary Beneficiary - Perpetual care trusts - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	$ 29,263	$ 110,734
Less than 12 months Unrealized Losses	1,158	6,168
12 Months or more Fair Value	46,247	61,151
12 Months or more Unrealized Losses	2,285	3,740
Total Fair Value	75,510	171,885
Total Unrealized Losses	3,443	9,908
Fixed maturities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	6,115	12,517
Less than 12 months Unrealized Losses	371	536
12 Months or more Fair Value	2,096	4,617
12 Months or more Unrealized Losses	199	310
Total Fair Value	8,211	17,134
Total Unrealized Losses	570	846
Fixed maturities | U.S. governmental securities
Investments, Unrealized Loss Position [Line Items]
12 Months or more Fair Value		112
Total Fair Value		112
Fixed maturities | Corporate debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	6,115	12,482
Less than 12 months Unrealized Losses	371	535
12 Months or more Fair Value	2,096	4,505
12 Months or more Unrealized Losses	199	310
Total Fair Value	8,211	16,987
Total Unrealized Losses	570	845
Fixed maturities | Other debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value		35
Less than 12 months Unrealized Losses		1
Total Fair Value		35
Total Unrealized Losses		1
Mutual funds-debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	21,362	81,215
Less than 12 months Unrealized Losses	665	4,263
12 Months or more Fair Value	39,903	50,774
12 Months or more Unrealized Losses	1,647	2,917
Total Fair Value	61,265	131,989
Total Unrealized Losses	2,312	7,180
Mutual funds-equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	1,496	16,514
Less than 12 months Unrealized Losses	115	1,363
12 Months or more Fair Value	4,181	4,308
12 Months or more Unrealized Losses	437	350
Total Fair Value	5,677	20,822
Total Unrealized Losses	552	1,713
Equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	290	488
Less than 12 months Unrealized Losses	7	6
12 Months or more Fair Value		1,137
12 Months or more Unrealized Losses		1
Total Fair Value	290	1,625
Total Unrealized Losses	7	7
Other invested assets
Investments, Unrealized Loss Position [Line Items]
12 Months or more Fair Value	67	315
12 Months or more Unrealized Losses	2	162
Total Fair Value	67	315
Total Unrealized Losses	$ 2	$ 162